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If (a_n=9n+5), what is (a_9-a_6)?

Answer and explanation

Correct answer: 27

Given \(a_n=9n+5\), \(a_9=9\times9+5=86\) and \(a_6=9\times6+5=59\). Hence, \(a_9-a_6=86-59=27\). Option 24 is incorrect because the difference between the indices is \(9-6=3\), and each successive term increases by 9; thus the difference is \(3\times9=27\). Exam tip: for a linear sequence \(a_n=dn+c\), use \(a_p-a_q=d(p-q)\) for a quick calculation.

Related tags

SequencesProgressionsNth TermArithmetic SequenceDifference Of TermsSequences And ProgressionsMathematicsClass 9 Mcq

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